ST STM32L152-EVAL - Embedded Boot Loader Mode

AN3216 Boot configuration
Doc ID 17496 Rev 5 19/30
4.3 Embedded boot loader mode
The embedded boot loader is used to reprogram the Flash memory through one of the
following interfaces: USART1 or USART2. This program is located in the system memory
and is programmed by ST during production (see the STM32L Flash programming manual
for further details).